Universal line concentrator



May 10, 1966 R. G. FISHER UNIVERSAL LINE CONCENTRATOR 69 Sheets-Sheet 1Filed Deo. 31, 1962 May 10, 1966 R` G. FISHER UNIVERSAL LINECONCENTRATOR e9 sheets-sheet z Filed Deo. 31, 1962 69 Sheets-Sheet 3 R.G. FISHER UNIVERSAL LINE CONCENTRATOR May l0, 1966 Filed Dec.

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1. A TELEPHONE LINE CONCENTRATING SYSTEM COMPRISING A PLURALITY OF PAIRSOF FIELD AND CENTRAL OFFICE UNITS, EACH OF SAID FIELD UNITS BEINGCONNECTED TO A PLURALITY OF SUBSCRIBER LINES, AND EACH OF SAID CENTRALOFFICE UNITS BEING CONNECTED TO A PLURALITY OF RESPECTIVE LINE CIRCUITS;A RESPECTIVE PLURALITY OF VOICE COMMUNICATION TRUNKS EXTENDED BETWEENEACH PAIR OF SAID FIELD AND CENTRAL OFFICE UNITS; RESPECTIVE CONTROLCONDUCTORS EXTENDED BETWEEN EACH PAIR OF SAID FIELD AND CENTRAL OFFICEUNITS; AND COMMON CONTROL MEANS CONNECTED TO EACH OF SAID CENTRAL OFFICEUNITS, AND COMMON CONTROL MEANS INCLUDING (1) MEANS FOR SCANNING ALL OFSAID LINE CIRCUITS FOR SERVICE REQUESTS, MEANS FOR TRANSMITTING SIGNALSOVER SAID CONTROL CONDUCTORS TO SAID FIELD UNITS TO CONTROL THE SCANNINGOF ALL OF SAID SUBSCRIBER LINES FOR SERVICE REQUESTS, MEANS FORCONNECTING SAID LINE CIRCUITS TO SAID TRUNKS RESPONSIVE TO SERVICEREQUEST AND FOR TRANSMITTING SWITCHING INFORMATION OVER SAID CONTROLCONDUCTORS TO CAUSE SAID FIELD UNITS TO CONNECT SAID SUBSCRIBER LINES TOSAID TRUNKS; (2) MEANS FOR SCANNING SAID TRUNKS TO DETERMINE RELEASEREQUESTS OF SAID TRUNKS, MEANS FOR DISESTABLISHING THE CONNECTIONSBETWEEN THE LINE CIRCUITS CONNECTED TO SAID TRUNKS RESPONSIVE TO SAIDTRUNK ELEASE REQUESTS, AND FOR TRANSMITTING SWITCHING INFORMATION OVERSAID CONTROL CONDUCTORS TO CAUSE SAID FIELD UNITS TO DISESTABLISH THECONNECTIONS BETWEEN THE RESPECTIVE SUBSCRIBER LINES AND SAID TRUNKS; AND(3) MEANS FOR DETECTING THE INTERCONNECTION OF ANY TWO TRUNKS IN THESAME PLURALITY THROUGH TWO CONNECTED LINE CIRCUITS IN THE SAMEPLURALITY, MEANS FOR